Seeder and cultivator tooth.



T. B. ROWELL. SEEDER AND GULTIVATOB TOOTH.

APPLICATION FILED JUNE 27, 1910.

Patented Aug. 8, 1911.

uJLuMBlA PLANOORAPH cu, WASHINGTON. D. C.

UNITED STATES PATENT ()FFTCE.

THEODORE B. ROWELL, OF BEAVER DAM, WISCONSIN.

SEEDER AND CULTIVATOR TOOTH.

To all whom it may concern:

Be it known that I, THEODORE B. RownLL, a citizen of the United States,and resident of Beaver Dam, in the county of Dodge and State ofWisconsin, have invented certain new and useful Improvements in Seederand Cultivator Teeth; and I do hereby declare that the following is afull, clear, and exact description thereof.

The improvements consist in what is herein particularly set forth withreference to the accompanying drawings and pointed out in claims of thisspecification, the object of the invention being to provide simple,economical and durable spring-trip tooth mechanism of advantageousconstruction for seeders and Cultivators.

Figure 1 of the drawings represents a partly sectional sideelevation ofa springtrip tooth mechanism in accordance with my invention, the tripof the tooth bein illus- 'trated by dotted lines; Figs. 2 and 3, planviews of fragments of the mechanism inverted; Fig. 4, a transversesection View indicated by line 44 in Fig. 2, and Figs. 5 and 6, similarviews respectively indicated by lines 55 and 6-6 in Fig. 1.

Referring by numerals to the drawings, 7 indicates each of a pair ofsuitably bent flat metal bars set edgewise and suitably braced apart inpractice, these bars being for p1v otal union at their forward ends witha hanger-clip or draft-rod of a seeder or cultivator, as is common inthe art to which my improvements relate. Arranged between the bars,forward of the bends 0f the same, on a bolt 8, is a block 9 having rearupper flanges 10 that rest upon the adjacent edges of said bars, andstraddling a reduced portion of the block, forward of the bolt, is oneforked end of a toggle-link 11, the fork-branches 12 of this end of thelink being engaged by said bolt. A head of the bolt opposes one of thebars 7 and a nut 13 is run on said bolt against the other of said bars.

The toggle-link 11 is a casting having depending side fianges 14, by whch 1t is strengthened, and said link is provided with upper lateral lugs15 that normally abut the under edges of the aforesaid bars. Anotherforked end of said link is in pivotal connection with the eye-end 16' ofanother togglelink 16 having the form of a rod that is screw-threaded atthe other end thereof. A

Specification of Letters Patent.

Application filed June 27, 1910.

Patented Aug. 8, 1911.

Serial No. 569,175.

rod 17 extends through the upper fork of the link 11 and through an eyein a depend ing rear lug 9 of the block 9, both ends of this rod beingscrew-threaded. A spiralspring 18 is arranged on the rod 17 between theblock-lug 9 and a rod-engaging washer 19, the tension of this springbeing regulated by the adjustment of a nut 20 run on said rod againstsaid washer. Another such spring 21 is arranged on the rod 17 bet-weenlugs 22 of the toggle-link 11 and a rod-engaging washer 23, its tensionbeing regu lated by the adjustment of a nut 24 run on said rodagainstthe washer last noted, this washer and the one aforesaid beingeach provided with a shank that extends between the bars 7 to serve as atrash-guard. The toggle-link 16 extends through a slide in the form of asleeve 25 that is provided with a depending eye-lug 25 engaging theforked upper end 26 of a shank 26 and a seeder or cultivator tooth 27 isbolted to the other end of the shank. A coupling-pin 28 connects theeye-lug of the sleeve and the forkend of the shank, and this shank isheld in connection with the lower bent ends of the bars 7, between thesame, on a pivot-pin 29, said sleeve being rigidly secured in its adjusted position on the toggle-link 16 between nuts 30, 31, for which saidlink is screw-threaded.

By adjustment of the sleeve 25, the normal set of the shank 26 and tooth27 is determined, and the yield of said tooth to an obstruct-ion 'in itspath is against the resistance of the springs 18, 21, the spring 18being compressed against lug 9 of the block 9, and the spring 21 againstthe washer 23 in cidental to a forward swing of the togglelink 11, saidsprings reacting, when the obstruction is passed, to return said shankand tooth to normal position.

Because of the link lugs 15 that oppose the under edges of the bends ofthe bars 7 the knuckle of the toggle is prevented from buckling upwardpast the line of dead center regardless of the adjustment of the sleeve25 to regulate the pitch of the tooth 27 with reference to the depth ofrun by the same, and hence it is impossible for the operator of theseeder or cultivator to get said knuckle in such position as tointerfere with the trip of said tooth to clear an obstruction in itspath, this being an advantageous feature of the mechanism, in

that liability of fracture of a part or parts of said mechanism isobviated, and there are no set-screws to Wort loose and become lost.

The tension of the springs 18 and 21 determines the resistance of thetooth 27 to obstructions, and this tension being adjustable said toothmay be readily set to trip hard or easy.

I claim:

1. r seeder or cultivator spring-trip tooth mechanism comprising adraft-member, a spring-controlled toggle having a link thereof inpivotal connection With the d aft-member against which it is normallystopped in position to prevent buckling of the toggle-knuckle in onedirection past the line of dead-center, a slide adjustablelongitudinally of the other link of the toggle, means for holding theslide in adjusted position, and a pivotal tooth-shank having its upperend coupled to said slide.

2. A seeder or cultivator spring-trip tooth mechanism comprising a pairof bars, a spring-controlled toggle in pivotal connection with the barsand provided with bar opposing stop-lugs that limit play of thetoggle-knuckle and thereby prevent buckling of the same in one directionpast the line of dead-center, a slide adjustable longitudinally of theother link of the toggle means for holding the slide in adjustedposition, and a pivotal tooth-shank having its upper end coupled to saidslide.

8. A seeder or cultivator sprlng-trip tooth-mechanlsm comprising a pairof draft-bars, an interposed block, a springcontrolled toggle having ablock-straddling link in pivotal connection with the bars and providedwith bar-opposing stop-lugs that limit play of the toggle-knuckle and4-0 thereby prevent buckle of the same in one direction past the line ofdead center, a rod guided in the block, springs on the rod opposing saidlink and block, means in connection with said rod for regulating tensionof the springs, a slide adjustable on the other link of the toggle,means for holding the slide in adjusted position, and a pivotaltooth-shank having its upper end coupled to said slide.

e. A seeder or cultivator spring-trip tooth mechanism comprising adraft-me1n her, a spring-controlled toggle having a link thereof inpivotal connection With the draft-member against which it is normallystopped in position to prevent buckling of the toggleknuckle in onedirection past the line of dead-center, a sleeve and sleeveclamping nutsadjustable on the other link of the toggle, and a pivotal tooth-shankhaving its upper end coupled to the sleeve. In testimony that I claimthe foregoing I have hereunto set my hand at Beaver Dam in the county ofDodge and State of iscousin in the presence of two Witnesses.

THEODORE B. ROWELL.

\Vitnesses E. D. STACY, B. S. BARBER.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. C.

